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    <script>
        //值类型
        //赋值 将 等号 右边的值复制一份给等边左边
        var num = 18;
        var num1 = num;
        console.log(num, num1);// 18  18 


        num1 = 20;
        console.log(num, num1);//18  20

        //引用类型  
        //赋值 将等号右边的值复制一份给左边
        var obj = {
            name: '老曾',
            age: 18
        }
        var obj2 = obj;
        console.log(obj.age, obj.age);// 18,18
        obj2.age = 18;
        console.log(obj.age, obj2.age);//20 20






















    </script>
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